Hi Hun, I'm suffering with back pain now and again too, think it's where all the ligaments and muscles are softening. Does it feel like stretching pains or period cramps? With both my successful pregnancies I had pains from early on,sharp pains, stretching, the odd mild cramp, as I got bigger the pains got more intense, and they can be quite scary, but ligament pain can be very uncomfortable and it's inevitable that as your uterus gets bigger it'll put pressure on organs and put a strain on parts of your body u never knew u had!! This early stuff is more concerning but honestly, it's totally normal. I only had pain with 1 of my miscarriages and that was significant enough for me to get to a&e.... I also had no idea I was even pregnant with that one.
Also, could you maybe need to poo?!!! That's a cramping and back pain symptom!!! Each time I feel like that I know it's prob time to try and go to the toilet and it always makes it better! Xxx